No, I wouldn't say you have messed up your life, as you are still young.
Staying on at college and going to uni isn't the be-all and end-all. I graduated 5 years ago and I'm still earning well below average national wage, in fact I'd likely be much better off if I'd gone straight into employment after A-levels. If you aren't likely to do a course properly and attain a decent grade, I think it's often best to be brave and drop out as you have done.
My advice is don't look at the past and wonder 'what if....?' about decisions you have taken. What is more important are the decisions that you take from this point forward - you have the power to choose the direction your life will take (to some extent).
Staying on at college and going to uni isn't the be-all and end-all. I graduated 5 years ago and I'm still earning well below average national wage, in fact I'd likely be much better off if I'd gone straight into employment after A-levels. If you aren't likely to do a course properly and attain a decent grade, I think it's often best to be brave and drop out as you have done.
My advice is don't look at the past and wonder 'what if....?' about decisions you have taken. What is more important are the decisions that you take from this point forward - you have the power to choose the direction your life will take (to some extent).

already maintain an active server, bought myself one just to get me some knowledge into them.

